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Unified Diff: src/gpu/gl/GrGLSLBlend.cpp

Issue 1334293003: Create fragment processor for performing input color blend with child processor (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: fix Created 5 years, 3 months ago
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Index: src/gpu/gl/GrGLSLBlend.cpp
diff --git a/src/gpu/gl/GrGLSLBlend.cpp b/src/gpu/gl/GrGLSLBlend.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..b6224e82306a3bc4964dcd4b225395383cdd7476
--- /dev/null
+++ b/src/gpu/gl/GrGLSLBlend.cpp
@@ -0,0 +1,435 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "GrGLSLBlend.h"
+#include "gl/builders/GrGLFragmentShaderBuilder.h"
+
+//////////////////////////////////////////////////////////////////////////////
+// Advanced (non-coeff) blend helpers
+//////////////////////////////////////////////////////////////////////////////
+
+static void hard_light(GrGLFragmentBuilder* fsBuilder,
+ const char* final,
+ const char* src,
+ const char* dst) {
+ static const char kComponents[] = { 'r', 'g', 'b' };
+ for (size_t i = 0; i < SK_ARRAY_COUNT(kComponents); ++i) {
+ char component = kComponents[i];
+ fsBuilder->codeAppendf("if (2.0 * %s.%c <= %s.a) {", src, component, src);
+ fsBuilder->codeAppendf("%s.%c = 2.0 * %s.%c * %s.%c;",
+ final, component, src, component, dst, component);
+ fsBuilder->codeAppend("} else {");
+ fsBuilder->codeAppendf("%s.%c = %s.a * %s.a - 2.0 * (%s.a - %s.%c) * (%s.a - %s.%c);",
+ final, component, src, dst, dst, dst, component, src, src,
+ component);
+ fsBuilder->codeAppend("}");
+ }
+ fsBuilder->codeAppendf("%s.rgb += %s.rgb * (1.0 - %s.a) + %s.rgb * (1.0 - %s.a);",
+ final, src, dst, dst, src);
+}
+
+// Does one component of color-dodge
+static void color_dodge_component(GrGLFragmentBuilder* fsBuilder,
+ const char* final,
+ const char* src,
+ const char* dst,
+ const char component) {
+ fsBuilder->codeAppendf("if (0.0 == %s.%c) {", dst, component);
+ fsBuilder->codeAppendf("%s.%c = %s.%c * (1.0 - %s.a);",
+ final, component, src, component, dst);
+ fsBuilder->codeAppend("} else {");
+ fsBuilder->codeAppendf("float d = %s.a - %s.%c;", src, src, component);
+ fsBuilder->codeAppend("if (0.0 == d) {");
+ fsBuilder->codeAppendf("%s.%c = %s.a * %s.a + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);",
+ final, component, src, dst, src, component, dst, dst, component,
+ src);
+ fsBuilder->codeAppend("} else {");
+ fsBuilder->codeAppendf("d = min(%s.a, %s.%c * %s.a / d);",
+ dst, dst, component, src);
+ fsBuilder->codeAppendf("%s.%c = d * %s.a + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);",
+ final, component, src, src, component, dst, dst, component, src);
+ fsBuilder->codeAppend("}");
+ fsBuilder->codeAppend("}");
+}
+
+// Does one component of color-burn
+static void color_burn_component(GrGLFragmentBuilder* fsBuilder,
+ const char* final,
+ const char* src,
+ const char* dst,
+ const char component) {
+ fsBuilder->codeAppendf("if (%s.a == %s.%c) {", dst, dst, component);
+ fsBuilder->codeAppendf("%s.%c = %s.a * %s.a + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);",
+ final, component, src, dst, src, component, dst, dst, component,
+ src);
+ fsBuilder->codeAppendf("} else if (0.0 == %s.%c) {", src, component);
+ fsBuilder->codeAppendf("%s.%c = %s.%c * (1.0 - %s.a);",
+ final, component, dst, component, src);
+ fsBuilder->codeAppend("} else {");
+ fsBuilder->codeAppendf("float d = max(0.0, %s.a - (%s.a - %s.%c) * %s.a / %s.%c);",
+ dst, dst, dst, component, src, src, component);
+ fsBuilder->codeAppendf("%s.%c = %s.a * d + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);",
+ final, component, src, src, component, dst, dst, component, src);
+ fsBuilder->codeAppend("}");
+}
+
+// Does one component of soft-light. Caller should have already checked that dst alpha > 0.
+static void soft_light_component_pos_dst_alpha(GrGLFragmentBuilder* fsBuilder,
+ const char* final,
+ const char* src,
+ const char* dst,
+ const char component) {
+ // if (2S < Sa)
+ fsBuilder->codeAppendf("if (2.0 * %s.%c <= %s.a) {", src, component, src);
+ // (D^2 (Sa-2 S))/Da+(1-Da) S+D (-Sa+2 S+1)
+ fsBuilder->codeAppendf("%s.%c = (%s.%c*%s.%c*(%s.a - 2.0*%s.%c)) / %s.a +"
+ "(1.0 - %s.a) * %s.%c + %s.%c*(-%s.a + 2.0*%s.%c + 1.0);",
+ final, component, dst, component, dst, component, src, src,
+ component, dst, dst, src, component, dst, component, src, src,
+ component);
+ // else if (4D < Da)
+ fsBuilder->codeAppendf("} else if (4.0 * %s.%c <= %s.a) {",
+ dst, component, dst);
+ fsBuilder->codeAppendf("float DSqd = %s.%c * %s.%c;",
+ dst, component, dst, component);
+ fsBuilder->codeAppendf("float DCub = DSqd * %s.%c;", dst, component);
+ fsBuilder->codeAppendf("float DaSqd = %s.a * %s.a;", dst, dst);
+ fsBuilder->codeAppendf("float DaCub = DaSqd * %s.a;", dst);
+ // (Da^3 (-S)+Da^2 (S-D (3 Sa-6 S-1))+12 Da D^2 (Sa-2 S)-16 D^3 (Sa-2 S))/Da^2
+ fsBuilder->codeAppendf("%s.%c ="
+ "(DaSqd*(%s.%c - %s.%c * (3.0*%s.a - 6.0*%s.%c - 1.0)) +"
+ " 12.0*%s.a*DSqd*(%s.a - 2.0*%s.%c) - 16.0*DCub * (%s.a - 2.0*%s.%c) -"
+ " DaCub*%s.%c) / DaSqd;",
+ final, component, src, component, dst, component,
+ src, src, component, dst, src, src, component, src, src,
+ component, src, component);
+ fsBuilder->codeAppendf("} else {");
+ // -sqrt(Da * D) (Sa-2 S)-Da S+D (Sa-2 S+1)+S
+ fsBuilder->codeAppendf("%s.%c = %s.%c*(%s.a - 2.0*%s.%c + 1.0) + %s.%c -"
+ " sqrt(%s.a*%s.%c)*(%s.a - 2.0*%s.%c) - %s.a*%s.%c;",
+ final, component, dst, component, src, src, component, src, component,
+ dst, dst, component, src, src, component, dst, src, component);
+ fsBuilder->codeAppendf("}");
+}
+
+// Adds a function that takes two colors and an alpha as input. It produces a color with the
+// hue and saturation of the first color, the luminosity of the second color, and the input
+// alpha. It has this signature:
+// vec3 set_luminance(vec3 hueSatColor, float alpha, vec3 lumColor).
+static void add_lum_function(GrGLFragmentBuilder* fsBuilder, SkString* setLumFunction) {
+ // Emit a helper that gets the luminance of a color.
+ SkString getFunction;
+ GrGLShaderVar getLumArgs[] = {
+ GrGLShaderVar("color", kVec3f_GrSLType),
+ };
+ SkString getLumBody("return dot(vec3(0.3, 0.59, 0.11), color);");
+ fsBuilder->emitFunction(kFloat_GrSLType,
+ "luminance",
+ SK_ARRAY_COUNT(getLumArgs), getLumArgs,
+ getLumBody.c_str(),
+ &getFunction);
+
+ // Emit the set luminance function.
+ GrGLShaderVar setLumArgs[] = {
+ GrGLShaderVar("hueSat", kVec3f_GrSLType),
+ GrGLShaderVar("alpha", kFloat_GrSLType),
+ GrGLShaderVar("lumColor", kVec3f_GrSLType),
+ };
+ SkString setLumBody;
+ setLumBody.printf("float diff = %s(lumColor - hueSat);", getFunction.c_str());
+ setLumBody.append("vec3 outColor = hueSat + diff;");
+ setLumBody.appendf("float outLum = %s(outColor);", getFunction.c_str());
+ setLumBody.append("float minComp = min(min(outColor.r, outColor.g), outColor.b);"
+ "float maxComp = max(max(outColor.r, outColor.g), outColor.b);"
+ "if (minComp < 0.0 && outLum != minComp) {"
+ "outColor = outLum + ((outColor - vec3(outLum, outLum, outLum)) * outLum) /"
+ "(outLum - minComp);"
+ "}"
+ "if (maxComp > alpha && maxComp != outLum) {"
+ "outColor = outLum +"
+ "((outColor - vec3(outLum, outLum, outLum)) * (alpha - outLum)) /"
+ "(maxComp - outLum);"
+ "}"
+ "return outColor;");
+ fsBuilder->emitFunction(kVec3f_GrSLType,
+ "set_luminance",
+ SK_ARRAY_COUNT(setLumArgs), setLumArgs,
+ setLumBody.c_str(),
+ setLumFunction);
+}
+
+// Adds a function that creates a color with the hue and luminosity of one input color and
+// the saturation of another color. It will have this signature:
+// float set_saturation(vec3 hueLumColor, vec3 satColor)
+static void add_sat_function(GrGLFragmentBuilder* fsBuilder, SkString* setSatFunction) {
+ // Emit a helper that gets the saturation of a color
+ SkString getFunction;
+ GrGLShaderVar getSatArgs[] = { GrGLShaderVar("color", kVec3f_GrSLType) };
+ SkString getSatBody;
+ getSatBody.printf("return max(max(color.r, color.g), color.b) - "
+ "min(min(color.r, color.g), color.b);");
+ fsBuilder->emitFunction(kFloat_GrSLType,
+ "saturation",
+ SK_ARRAY_COUNT(getSatArgs), getSatArgs,
+ getSatBody.c_str(),
+ &getFunction);
+
+ // Emit a helper that sets the saturation given sorted input channels. This used
+ // to use inout params for min, mid, and max components but that seems to cause
+ // problems on PowerVR drivers. So instead it returns a vec3 where r, g ,b are the
+ // adjusted min, mid, and max inputs, respectively.
+ SkString helperFunction;
+ GrGLShaderVar helperArgs[] = {
+ GrGLShaderVar("minComp", kFloat_GrSLType),
+ GrGLShaderVar("midComp", kFloat_GrSLType),
+ GrGLShaderVar("maxComp", kFloat_GrSLType),
+ GrGLShaderVar("sat", kFloat_GrSLType),
+ };
+ static const char kHelperBody[] = "if (minComp < maxComp) {"
+ "vec3 result;"
+ "result.r = 0.0;"
+ "result.g = sat * (midComp - minComp) / (maxComp - minComp);"
+ "result.b = sat;"
+ "return result;"
+ "} else {"
+ "return vec3(0, 0, 0);"
+ "}";
+ fsBuilder->emitFunction(kVec3f_GrSLType,
+ "set_saturation_helper",
+ SK_ARRAY_COUNT(helperArgs), helperArgs,
+ kHelperBody,
+ &helperFunction);
+
+ GrGLShaderVar setSatArgs[] = {
+ GrGLShaderVar("hueLumColor", kVec3f_GrSLType),
+ GrGLShaderVar("satColor", kVec3f_GrSLType),
+ };
+ const char* helpFunc = helperFunction.c_str();
+ SkString setSatBody;
+ setSatBody.appendf("float sat = %s(satColor);"
+ "if (hueLumColor.r <= hueLumColor.g) {"
+ "if (hueLumColor.g <= hueLumColor.b) {"
+ "hueLumColor.rgb = %s(hueLumColor.r, hueLumColor.g, hueLumColor.b, sat);"
+ "} else if (hueLumColor.r <= hueLumColor.b) {"
+ "hueLumColor.rbg = %s(hueLumColor.r, hueLumColor.b, hueLumColor.g, sat);"
+ "} else {"
+ "hueLumColor.brg = %s(hueLumColor.b, hueLumColor.r, hueLumColor.g, sat);"
+ "}"
+ "} else if (hueLumColor.r <= hueLumColor.b) {"
+ "hueLumColor.grb = %s(hueLumColor.g, hueLumColor.r, hueLumColor.b, sat);"
+ "} else if (hueLumColor.g <= hueLumColor.b) {"
+ "hueLumColor.gbr = %s(hueLumColor.g, hueLumColor.b, hueLumColor.r, sat);"
+ "} else {"
+ "hueLumColor.bgr = %s(hueLumColor.b, hueLumColor.g, hueLumColor.r, sat);"
+ "}"
+ "return hueLumColor;",
+ getFunction.c_str(), helpFunc, helpFunc, helpFunc, helpFunc,
+ helpFunc, helpFunc);
+ fsBuilder->emitFunction(kVec3f_GrSLType,
+ "set_saturation",
+ SK_ARRAY_COUNT(setSatArgs), setSatArgs,
+ setSatBody.c_str(),
+ setSatFunction);
+}
+
+static void emit_advanced_xfermode_code(GrGLFragmentBuilder* fsBuilder, const char* srcColor,
+ const char* dstColor, const char* outputColor,
+ SkXfermode::Mode mode) {
+ SkASSERT(srcColor);
+ SkASSERT(dstColor);
+ SkASSERT(outputColor);
+ // These all perform src-over on the alpha channel.
+ fsBuilder->codeAppendf("%s.a = %s.a + (1.0 - %s.a) * %s.a;",
+ outputColor, srcColor, srcColor, dstColor);
+
+ switch (mode) {
+ case SkXfermode::kOverlay_Mode:
+ // Overlay is Hard-Light with the src and dst reversed
+ hard_light(fsBuilder, outputColor, dstColor, srcColor);
+ break;
+ case SkXfermode::kDarken_Mode:
+ fsBuilder->codeAppendf("%s.rgb = min((1.0 - %s.a) * %s.rgb + %s.rgb, "
+ "(1.0 - %s.a) * %s.rgb + %s.rgb);",
+ outputColor,
+ srcColor, dstColor, srcColor,
+ dstColor, srcColor, dstColor);
+ break;
+ case SkXfermode::kLighten_Mode:
+ fsBuilder->codeAppendf("%s.rgb = max((1.0 - %s.a) * %s.rgb + %s.rgb, "
+ "(1.0 - %s.a) * %s.rgb + %s.rgb);",
+ outputColor,
+ srcColor, dstColor, srcColor,
+ dstColor, srcColor, dstColor);
+ break;
+ case SkXfermode::kColorDodge_Mode:
+ color_dodge_component(fsBuilder, outputColor, srcColor, dstColor, 'r');
+ color_dodge_component(fsBuilder, outputColor, srcColor, dstColor, 'g');
+ color_dodge_component(fsBuilder, outputColor, srcColor, dstColor, 'b');
+ break;
+ case SkXfermode::kColorBurn_Mode:
+ color_burn_component(fsBuilder, outputColor, srcColor, dstColor, 'r');
+ color_burn_component(fsBuilder, outputColor, srcColor, dstColor, 'g');
+ color_burn_component(fsBuilder, outputColor, srcColor, dstColor, 'b');
+ break;
+ case SkXfermode::kHardLight_Mode:
+ hard_light(fsBuilder, outputColor, srcColor, dstColor);
+ break;
+ case SkXfermode::kSoftLight_Mode:
+ fsBuilder->codeAppendf("if (0.0 == %s.a) {", dstColor);
+ fsBuilder->codeAppendf("%s.rgba = %s;", outputColor, srcColor);
+ fsBuilder->codeAppendf("} else {");
+ soft_light_component_pos_dst_alpha(fsBuilder, outputColor, srcColor, dstColor, 'r');
+ soft_light_component_pos_dst_alpha(fsBuilder, outputColor, srcColor, dstColor, 'g');
+ soft_light_component_pos_dst_alpha(fsBuilder, outputColor, srcColor, dstColor, 'b');
+ fsBuilder->codeAppendf("}");
+ break;
+ case SkXfermode::kDifference_Mode:
+ fsBuilder->codeAppendf("%s.rgb = %s.rgb + %s.rgb -"
+ "2.0 * min(%s.rgb * %s.a, %s.rgb * %s.a);",
+ outputColor, srcColor, dstColor, srcColor, dstColor,
+ dstColor, srcColor);
+ break;
+ case SkXfermode::kExclusion_Mode:
+ fsBuilder->codeAppendf("%s.rgb = %s.rgb + %s.rgb - "
+ "2.0 * %s.rgb * %s.rgb;",
+ outputColor, dstColor, srcColor, dstColor, srcColor);
+ break;
+ case SkXfermode::kMultiply_Mode:
+ fsBuilder->codeAppendf("%s.rgb = (1.0 - %s.a) * %s.rgb + "
+ "(1.0 - %s.a) * %s.rgb + "
+ "%s.rgb * %s.rgb;",
+ outputColor, srcColor, dstColor, dstColor, srcColor,
+ srcColor, dstColor);
+ break;
+ case SkXfermode::kHue_Mode: {
+ // SetLum(SetSat(S * Da, Sat(D * Sa)), Sa*Da, D*Sa) + (1 - Sa) * D + (1 - Da) * S
+ SkString setSat, setLum;
+ add_sat_function(fsBuilder, &setSat);
+ add_lum_function(fsBuilder, &setLum);
+ fsBuilder->codeAppendf("vec4 dstSrcAlpha = %s * %s.a;",
+ dstColor, srcColor);
+ fsBuilder->codeAppendf("%s.rgb = %s(%s(%s.rgb * %s.a, dstSrcAlpha.rgb),"
+ "dstSrcAlpha.a, dstSrcAlpha.rgb);",
+ outputColor, setLum.c_str(), setSat.c_str(), srcColor,
+ dstColor);
+ fsBuilder->codeAppendf("%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;",
+ outputColor, srcColor, dstColor, dstColor, srcColor);
+ break;
+ }
+ case SkXfermode::kSaturation_Mode: {
+ // SetLum(SetSat(D * Sa, Sat(S * Da)), Sa*Da, D*Sa)) + (1 - Sa) * D + (1 - Da) * S
+ SkString setSat, setLum;
+ add_sat_function(fsBuilder, &setSat);
+ add_lum_function(fsBuilder, &setLum);
+ fsBuilder->codeAppendf("vec4 dstSrcAlpha = %s * %s.a;",
+ dstColor, srcColor);
+ fsBuilder->codeAppendf("%s.rgb = %s(%s(dstSrcAlpha.rgb, %s.rgb * %s.a),"
+ "dstSrcAlpha.a, dstSrcAlpha.rgb);",
+ outputColor, setLum.c_str(), setSat.c_str(), srcColor,
+ dstColor);
+ fsBuilder->codeAppendf("%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;",
+ outputColor, srcColor, dstColor, dstColor, srcColor);
+ break;
+ }
+ case SkXfermode::kColor_Mode: {
+ // SetLum(S * Da, Sa* Da, D * Sa) + (1 - Sa) * D + (1 - Da) * S
+ SkString setLum;
+ add_lum_function(fsBuilder, &setLum);
+ fsBuilder->codeAppendf("vec4 srcDstAlpha = %s * %s.a;",
+ srcColor, dstColor);
+ fsBuilder->codeAppendf("%s.rgb = %s(srcDstAlpha.rgb, srcDstAlpha.a, %s.rgb * %s.a);",
+ outputColor, setLum.c_str(), dstColor, srcColor);
+ fsBuilder->codeAppendf("%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;",
+ outputColor, srcColor, dstColor, dstColor, srcColor);
+ break;
+ }
+ case SkXfermode::kLuminosity_Mode: {
+ // SetLum(D * Sa, Sa* Da, S * Da) + (1 - Sa) * D + (1 - Da) * S
+ SkString setLum;
+ add_lum_function(fsBuilder, &setLum);
+ fsBuilder->codeAppendf("vec4 srcDstAlpha = %s * %s.a;",
+ srcColor, dstColor);
+ fsBuilder->codeAppendf("%s.rgb = %s(%s.rgb * %s.a, srcDstAlpha.a, srcDstAlpha.rgb);",
+ outputColor, setLum.c_str(), dstColor, srcColor);
+ fsBuilder->codeAppendf("%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;",
+ outputColor, srcColor, dstColor, dstColor, srcColor);
+ break;
+ }
+ default:
+ SkFAIL("Unknown Custom Xfer mode.");
+ break;
+ }
+}
+
+//////////////////////////////////////////////////////////////////////////////
+// Porter-Duff blend helper
+//////////////////////////////////////////////////////////////////////////////
+
+static bool append_porterduff_term(GrGLFragmentBuilder* fsBuilder, SkXfermode::Coeff coeff,
+ const char* colorName, const char* srcColorName,
+ const char* dstColorName, bool hasPrevious) {
+ if (SkXfermode::kZero_Coeff == coeff) {
+ return hasPrevious;
+ } else {
+ if (hasPrevious) {
+ fsBuilder->codeAppend(" + ");
+ }
+ fsBuilder->codeAppendf("%s", colorName);
+ switch (coeff) {
+ case SkXfermode::kOne_Coeff:
+ break;
+ case SkXfermode::kSC_Coeff:
+ fsBuilder->codeAppendf(" * %s", srcColorName);
+ break;
+ case SkXfermode::kISC_Coeff:
+ fsBuilder->codeAppendf(" * (vec4(1.0) - %s)", srcColorName);
+ break;
+ case SkXfermode::kDC_Coeff:
+ fsBuilder->codeAppendf(" * %s", dstColorName);
+ break;
+ case SkXfermode::kIDC_Coeff:
+ fsBuilder->codeAppendf(" * (vec4(1.0) - %s)", dstColorName);
+ break;
+ case SkXfermode::kSA_Coeff:
+ fsBuilder->codeAppendf(" * %s.a", srcColorName);
+ break;
+ case SkXfermode::kISA_Coeff:
+ fsBuilder->codeAppendf(" * (1.0 - %s.a)", srcColorName);
+ break;
+ case SkXfermode::kDA_Coeff:
+ fsBuilder->codeAppendf(" * %s.a", dstColorName);
+ break;
+ case SkXfermode::kIDA_Coeff:
+ fsBuilder->codeAppendf(" * (1.0 - %s.a)", dstColorName);
+ break;
+ default:
+ SkFAIL("Unsupported Blend Coeff");
+ }
+ return true;
+ }
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
+void GrGLSLBlend::AppendMode(GrGLFragmentBuilder* fsBuilder, const char* srcColor,
+ const char* dstColor, const char* outColor,
+ SkXfermode::Mode mode) {
+
+ SkXfermode::Coeff srcCoeff, dstCoeff;
+ if (SkXfermode::ModeAsCoeff(mode, &srcCoeff, &dstCoeff)) {
+ fsBuilder->codeAppendf("%s = ", outColor);
+ // append src blend
+ bool didAppend = append_porterduff_term(fsBuilder, srcCoeff, srcColor, srcColor, dstColor,
+ false);
+ // append dst blend
+ if(!append_porterduff_term(fsBuilder, dstCoeff, dstColor, srcColor, dstColor, didAppend)) {
+ fsBuilder->codeAppend("vec4(0, 0, 0, 0)");
+ }
+ fsBuilder->codeAppend(";");
+ } else {
+ emit_advanced_xfermode_code(fsBuilder, srcColor, dstColor, outColor, mode);
+ }
+}
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